This situation is radically different from that of Terri Schiavo. Mrs. Schiavo was not dead, not brain-dead, not in pain or discomfort, not even "terminal" --- she was just an an otherwise healthy adult woman with a severe brain injury. Terri needed nothing but what any other human being needs --- nutrition and hydration, plus hygienic and comfort care --- to do what we all have a right to do: to go on living.
Making Terri Schiavo die by deliberate starvation/dehydration was murder.
But Jahi McMath is dead, and to keep ventilating her remains is the abuse of a corpse. I know that sounds severe, but in my judgment, that's what it objectively is.
Her parents need to make arrangements for the respectful and prayerful interment of her remains. Of course, if people were lying about Jahi McMath's condition, then the whole ethical judgment changes. But I understand that the doctors' findings --- even those brought into the case by Jahi's parents --- are unanimous.
I do feel sorry for the parents. Losing a child means deep, rending, lasting pain for the rest of their lives. May God console.
Yes, this case is very different from Terri’s case. But, in reading the mother’s court statement, I can understand why she is unwilling to believe the hospital. She says her daughter was experiencing complications after surgery that nurses insisted were normal. Then her daughter went into cardiac arrest. Afterward the doctor(s) came across as heartless and unsympathetic. Now there are other people telling her there is hope (even Terri’s family reportedly has been trying to help her), and her daughter seems alive to her when she visits her. In exactly the same position, I’m sure every single one of us here as mothers would be fighting just as hard.